Public alert and advisory systems

摘要: Public alert and advisory systems for the communication of emergency and/or other information from one or more central locations to a plurality remote locations, such as, by way example, regarding nuclear accident evacuation procedures. This system utilizes conventional programming stations as AM, FM TV stations, transmitting equipment, with being modulated second modulation technique differing first ordinary so that manually operated receivers will not be responsive information. The however, are transmitted information, sound warning alarm, display codes relating receive present audio depending upon specific configuration system. Normally given recognition receiver may different either on an individual group basis. Fault detection is provided configuring automatically provide fault indication if periodically reset communications link. A unique telephone link, also disclosed, can used reliability testing data communication. Various embodiments features disclosed.